He admits, however, that keeping his cool will be slightly easier in his new career than on the football pitch. An energetic central midfielder, he earned the ire of some Arsenal fans earlier this season when he gave away a penalty against Barcelona just 47 seconds after coming on as a substitute.
"When you [enter] a football field, there is passion, there is adrenalin," he says. "I'm quite calm off the pitch. But on the pitch, I transform myself. I become sometimes aggressive — in a good way. It's kind of transcendent, you know?"
"I consider us the gladiators of our time. When you're on the pitch and you're facing your opponent, it's him or you — and I would prefer it to be him than me."
But he says he intends to bring some of that competitive energy to the boardroom. "When I think about when we started the company, and now see that we have also offices in Holland, America . . . all of that for me is adrenalin. It is stimulation [that] has pushed me to keep going and to move forward."
The stereotypical footballer may be even less interested in climate change than business. Mr Flamini admits his is an unusual passion, even if on occasion his lifestyle fits the mould of a footballer more than a green entrepreneur.
What car does he drive? He replies with a laugh, "An E Class [Mercedes]." Is that the only one? "Let's not go there."
He has made other green changes such as recycling more and becoming vegetarian. But he adds that he does not believe that caring about climate change means a worse quality of life.
"We want to change things and allow people to still live the same style of life. So the idea would be, for example, one day to be able to drive the same car but with a biofuel instead."
Nor is biotechnology his only business interest. His next venture is a fintech company, although once again he is not yet ready to disclose either the company or the product.
For now, though, his primary focus remains on football, with Arsenal hoping to stay in next season's Premiership title race for longer than they did in the season that has just finished.
"Business is something I developed on the side of football and will probably be in my life after football. But today I am a football player and I dream about football and I eat football every day."